This circuit bent Mortal Kombat all-in-one was bent by request for System D-128. It has been modified with a second incorrect crystal clock that causes a glitch to the sound and video. That glitch can be activated by a switch or a LFO with speed control.
For more playability there is a square-wave generator thats triggered by hitting the block button and the pitch is controlled by the shorter knob.
All bends can be disabled by a switch so originally playability is intact.
A reset switch comes in handy when the bends ocasionally cause this to lock up. Video and audio output via the original RCA jacks.